Machine for skiving leather



C. A. HIRTH.

MACHINE FOR SKIVING LEATHER. APPLICATION'FILED SEPT. 8,- 1'911.

1,348,221 Patented Aug. 3, 1920.

UNITED srm'iss Aifxriaiar OFFICE..

CARL ALBERT HIRTH, 0F CANNSTATT, ANEAR STUTTGART, GERMANY, ASSIGNOR TO FORTUNA-WERKE ALBERT HIRTH, OF CANNSTATT, GERMANY...`

MACHINE FOR SKIVING LEATHER. i

T 0 all whom it may Concern.' j v Be it known that I, CARL ALBERTHIRTH, a citizen of the German Empire, residing in Cannstatt, near Stuttgart, Vrttemberg, inl said Empire, have invented certain new and useful Improvements in Machines for Skiviiig Leather., of which the following is a specification.

This invention relates toimprovements in leather skiving machines. 7

In machines for skiving or Vsplitting leather and the like, the leather, as is well known, is fed between a feed roller or theV like and a pressure-member, and the shape of the skiving is altered by suitably adjusting the pressure-member. In order to obtain an oblique skiving, for example, the usual practice has been to adjust the slanting position of the pressure member with relation to the ring-knife by means of an. adjusting mechanism, and to adjust the height of the pressure-member with relation to the knife by anotherv adjusting mechanism. n

As thealterationof the slanting position Vof the pressing suiface alsov alters the height ofthe several parts of thepressing surface with relation to the knife, it was necessary, with the adjusting devices heretofore used,

wvlien readjusting the slanting position of Y its cutting edge.

The object of this invention is to render the slant adjustment independent of the vertical or height adjustment, and vice versa, in such a manner that the slant or length of the skiving can be altered by simply adjusting the slant adjustment of the pressure-member alone, without altering the adjustment for the thickness of the edge of the skiving. This is effected by arranging the axis about which the pressure-member is adapted to swing for the slant adjustment, so that instead of that axis being, as

Specification of Letters Patent.

ring-knife, seen at right angles to the axis ofthe knife, and

Fig. 2 is a vertical .transverse section along the line A-'B of F ig. l, taken at right angles to the axis of the'knife and showing also the feed-roller, not seen in Fig. 1.

Similar letters of reference indicate coi'- responding parts throughout the several yfigures of the drawings.

The only portions of the feed-device here represented are the pressure-member and the method of attaching same and adjusting it with relation to the rotaryring-knife a, having av sharpened'k edge. The feed-roller is indicated at b1. The construction and operation of the same are well-known in the art, and require no detailed description. The pressure-member consists of a roller b which is adapted to be adjusted vertically in an arm e of the machine by means of the slide-piece CZ. e

To enable the roller Z9 to be obliquely adjusted in the vert-ical plane of Fig. l2, the slide-piece d is provided with an arc-shaped guide-surface 'yf-shown in section in Fig. l,

' the center of which is situated in or as close pressed against the part g of the roller-carrier by means of the clamping-screw m.

The mechanism for changing the pressure-roller I) for different classes of work is preferably arranged in the swinging portion g guided by the surface f, so that the adjusting mechanism remains the same for Patented Aug. 3, 1920.

rApplication led September 8, 1911. Serial No. 648,346.

Vwhich is supported against a spring-plate w secured in the tube g, is compressed by the spring-plate u, which is secured by means of a stem to the arm p. The arm p may now be turned aside so that the roller Z) can be changed and the pai'ts replaced, the spring o holding it firmly in 'any desired position.

It is not necessary for the pressure-roller L to be positively operated, as it might run free with the work; nevertheless a ball-joint connected with a driving piece is representedin the drawing. But it is not at all essential to vthe invention that aV roller b should be `used as the pressure-member, as anyv other pressure-memberfor instance a simple stationary presser-foot might be used. Y

It will be clearly evident that by the vertical or height-adjusting mechanism, the position of the point c can always be adjusted with relation to the edge of the ringknife in a perfectly definite manner, and that this adjustment is not altered by altering the slanting position ofthe roller b. Thus forl a definite thickness of the edge of the leather or other work under treatment the vertical. or height-adjustment can be obtained once for all by means of a single adjustment, while-the slant or width of the skiving can be modified as desired, without a ifecting this adjustment; or in other words, only a single adjusting' mechanism is needed for each of the two kinds of adjustment` (vertical or slant).

I claim: 'a

1. A machine for skiving leather, comprising a ring-knife, a pressure-member for the work fed thereto, having a work contacting surface conforming to the cutting edge of said knife, and an adjustable carrier for said pressure-member having an axis of adjustment located in the surface of contact between such member' and the work and atV a lateral edge of said surface of contact.

2. A machine forA skiving leather, comprising a ring-knife, a pressure-member for the work fed thereto having a work-contacting surface conforming to the cuttingedge of said knife, and an adjustable carrier for said pressure-member having an axis of adjustment substantially parallel to the axis of said knife and located inthe surface of contact between said member and the work and at a lateral edge of said surface of contact.

3. A machine for skiving leather, comprising a ring-knife, a pressure-member,

means for swinging said member in a plane at right angles to the direction of feed while simultaneously preserving the distance of a part of said member Vfrom saidknife, said means comprising a support having a curved guide, and a carrier for said member adjustable 1n said guide, and an operatingdevice engaging said carrier.

t. A machine for skiving leather, comprising a ring-knife, a pressure-member for Y the work fed thereto having a work contacting surface conforming to the cutting edge of said knife, an. adjustable carrier for said pressure-member having an axis of adjustment located on the surface of contact vbetween such member and the work and atV a lateral edge of said surface of contact, and a support for said carrier movable toward andaway from the knife.

soY

5. In'a machine for skiving or splittingl leather and other materials, the combination,

- with a feed-mechanism, of Va rotary ring! knife a pressure-roller a roller-Carr in@ s, L u l portion-having an arc-shaped guide-piece at Y its upper end, adapted to swing the V'pres-v sure-roller angularly relatively'to rsaid knife while simultaneouslyr preserving the Vdistance of a part of said pressure-roller there"Y from, means for adjusting the roller-carrycarrying portion and adapted for locking or .releasing the movable arm.`

In testimony that I claim the'foregoing asmy invention I have signedvmy name in presence of two Vsubscribing witnesses.

CARL ALBERT HIRTH.

Vitnesses:

ERNiis'r ENTENMANN, FRIDA KLAIBER. V 

